Copyright for dumbster source package in Bionic

Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: Dumbster
Source: http://downloads.sourceforge.net/project/dumbster/

Files: *
Copyright: 2003-2011, Jason Kitchen 
License: Apache-2.0

Files: debian/*
Copyright: 2011, Stefan Denker 
           2017, Emmanuel Bourg 
License: Apache-2.0

License: Apache-2.0
 On Debian systems, the full text of the Apache-2.0 license
 can be found in the file '/usr/share/common-licenses/Apache-2.0'